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A new route to produce efficient surface-enhanced Raman spectroscopy substrates: gold-decorated CdSe nanowires

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Abstract

Surface-enhanced Raman spectroscopy is a popular tool for the detection of extremely small quantities of target molecules. Au nanoparticles have been very successful in this respect due to local enhancement of the light intensity caused by their plasmon resonance. Furthermore, Au nanoparticles are biocompatible, and target substances can be easily attached to their surface. Here, we demonstrate that Au-decorated CdSe nanowires when employed as SERS substrates lead to an enhancement as large as 105 with respect to the flat Au surfaces. In the case of hybrid metal–CdSe nanowires, the Au nucleates preferably on lattice defects at the lateral facets of the nanowires, which leads to a homogeneous distribution of Au nanoparticles on the nanowire, and to an efficient quenching of the nanowire luminescence. Moreover, the size of the Au nanoparticles can be well controlled via the AuCl3 concentration in the fabrication process. We demonstrate the effectiveness of our SERS substrates with two target substances, namely, cresyl-violet and rhodamine-6G. Au-decorated nanowires can be easily fabricated in large quantities at low cost by wet-chemical synthesis. Furthermore, their deposition onto various substrates, as well as the functionalization of these wires with the target substances, is as straightforward as with the traditional markers.

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Authors and Affiliations

  1. Nanostructure Division, Italian Institute of Technology, Via Morego 30, 16163, Genoa, Italy

    Gobind Das, Ritun Chakraborty, Anisha Gopalakrishnan & Roman Krahne

  2. University of Genoa, Genoa, Italy

    Ritun Chakraborty & Anisha Gopalakrishnan

  3. Department of Chemistry and Biochemistry, University of Colorado at Boulder, UCB 215, Boulder, CO, USA

    Dmitry Baranov

  4. PSE and BESE Divisions, King Abdullah University Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia

    Enzo Di Fabrizio

  5. BIONEM Lab, University of Magna Graecia, Campus Salvatore Venuta, Viale Europa, 88100, Germaneto-Catanzaro, Italy

    Enzo Di Fabrizio

Authors
  1. Gobind Das
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  2. Ritun Chakraborty
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  3. Anisha Gopalakrishnan
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  4. Dmitry Baranov
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  5. Enzo Di Fabrizio
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  6. Roman Krahne
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Corresponding author

Correspondence to Roman Krahne.

Additional information

Special Issue Editors: Juan Manuel Rojo, Vasileios Koutsos

This article is part of the topical collection on Nanostructured Materials 2012

Ritun Chakraborty and Anisha Gopalakrishnan contributed equally to the study.

Electronic supplementary material

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11051_2013_1596_MOESM1_ESM.pdf

Supporting Information. Details on the analysis of the Au nanoparticle density of the Au–CdSe NW substrates, the calculation of the SERS enhancement factor, the morphology of the flat Au substrates, additional PL and Raman maps of the Au-decorated NWs, and additional SERS spectra recorded from CV functionalized Au-CdSe NWs are given in the supplementary information (PDF 2741 kb)

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Das, G., Chakraborty, R., Gopalakrishnan, A. et al. A new route to produce efficient surface-enhanced Raman spectroscopy substrates: gold-decorated CdSe nanowires. J Nanopart Res 15, 1596 (2013). https://doi.org/10.1007/s11051-013-1596-3

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  • DOI: https://doi.org/10.1007/s11051-013-1596-3

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